Electric lamp



March 18, 1930. H. e. MARTIN, JR

ELECTRI C LAMP Filed Aug. 9, 1928 W INVENTOR. %//W% M BY fi ATTORNEYS.

Patented Mar. 18, 1930 PATENT OFFICE HORACE G. MARTIN, IR, 01 NEW YORK, N. Y.

ELECTRIC LAMP Application filed August 9, 1928. Serial No 298,460.

This invention relates to improvements in desk, pedestal or wall lamps, more particularly to lampsof the type designed to give off a difiused or indirect light.

The objectionable features of the ordinary electric lamp are the annoying direct harsh glare and inability to control intensity of the light or its color by other than very complicated arrangements.

One of the objects of the present invention is to provide a lamp which will eliminate the objectionable glare and supply a soft pleasing diffused light.

A further object of the invention is to supply a simple means for light intensity and color variation in connection with desk or wall lamps.

Another object is to provide a lamp of this character which will be simple in construction and easy to manipulate.

A. further object is to provide a lamp having simple light intensity and color variation features.

With these and other objects in View my invention consists of the novel construction, combination and arrangement of elements which will be hereinafter more fully described and defined in the appended claims.

In the accompanying drawing in which similar reference characters denote corresponding parts Fig. 1 is a side elevation of one embodiment'of my device having a portion thereof in section to show structural details; Fig. 2 is a side elevation thereof incorporating a modified structure; Fig. 3 is a section along line 3-3 of Fig. 2 looking in the direction of the arrows and Fig. 4 is a detailed view of one of the elements of the modified structure.

In the present embodiment the lamp is shown as a portable lamp. The same comprises'a hollow base portion 10 which may be of metal, wood, hard rubber or any other suitable material and w'l1ich-.-has passages 11 for the electric lead in wires 12 leading from an electric source (not shown). Mounted in said base is a suitable electric socket 13 for an electric bulb 15 which may advantageously be provided with a suitable switch 14. Formed integrally with or fixed by thread, as

tioned along and within the tube 17 These at 16, bayonet joint or the like to the u per portion of the base 10 and thereby comp etely enclosing said bulb 14is a hollow light transmitting tube 17 having at its free end an enlarged'light dispensing and diffusing portion 18 of, any suitable shape, depending on the angle the arm 17 makes with the horizontal position. I

The inner surface of the arm 17 may' be polished, or treated or covered with a suitable coating to reflect the light rays emanating from the bulb 15. The inner surface of the enlarged end 18 is unpolished or may even be treated with a material such as chrome nickel having light dilfusing properties.

If desired the whole inner surface of the base 10 may be highly polished, treated or covered with a light reflection covering to in-v crease the efficiency of the lamp.

In use the light emanating from the bulb 15 will pass through the tube in which it will be reflected, from the inner face thereof and emerge therefrom through the diffuser 18 dispensing a soft light.

In the modification shown in Figs.'2 to 4 the lamp structure is identical with that of the one shown-in Fig. l with the exception that the diffuser 18' is of a slightly different shape whereby the diffused rays will be directed to avoid their striking the eye of the reader. The new features added are light intensity and nolor control. This I accomplish by providing screens 20 suitably posiscreens may be inserted into the tube through sl-ots19 provided in the latter.

The screens 20 may be made ofglass, celluloid or any other suitable transparent, semi-transparent, translucent or colored material. They may be of circular configuration to fit the interior of the tube 17 in transverse position. Mounted along a portion of the edge of the screen is a grooved member 22 formed integrally with or having attached to it a projecting stem 23 and formed with a knob 24 at its free end. Mounted diametrical- I 1y opposite said member 22 is a similarly grooved member 25 having a projecting pin 26 extending in alignment with the stem 23 and designed to engage an aperture 21 in the tube 17'.

Mounted around the outside of the tube 17' at the slots 19 are split rings 27 having slots 28 of similar size and shape to slots 19 on said tube, each slot 28 along its edges 28 having an identation 29 of sufficient size to engage the stem 23 of the screen 20, when said ring is properly adjusted in the tube. After the screen 20 is slipped into the tube 17 and its pin 26 passed into the aperture 21, the split ring 27 is rotated until'slots 28 and 19 coincide, and the pin 26 engages the identation 29. The screen becomes thus locked in the tube and may be rotated to any desired angle about its axis within the tube to vary light intensity or if colored to dispense a colored light. By providing several such screens along the length of the tube 17 differenth color; comb inations can be obtained.

Instead of dispensing the light at the end of the tube, the latter may beprovided with perforations in its circumference which will serve to dispense light along the tube.

It is of course possible to make various other modificationsin the construction and to apply my device to any type of wall or table transmitting tube having at one end means for engaging said support and at its opposite end a light dispensing means and adjustable light controlling means in said tube, said tube forming the sole means for transmitting the light generatedby said lamp to the exterior of said support.

2. In an electric lamp, a portable base having an open top, a socket on said base for an electric bulb, a light transmitting tubular member formed at one end with a mouth piece to tightly fit on said open top around said bulb and at its opposite end a light dispensing shade whose inner face is adapted to act as a difiuser.

3. In an electric lamp a portable opaque base into which an electric bulb may be mounted, a light transmitting tube one end of which is adapted to be mounted on said base'and when so mounted to conceal said lamp completely, reflecting means in said base and-said. tube for directing the rays of light generated by said lamp through said tube, and light diffuser and reflector mounted at the other end of said tube.

4., In an electric lamp, a portable hollow base, means for mounting an electric lamp in said base, a light transmitting tube angularly mounted to the upper portion of said base and thereby completely enclosing said lamp, reflecting means in said base for directing the rays of light generated by said lamp through said tube, an enlarged light diffuser and dispenser mounted on the free end of said tube and adjustable light regulating means mounted in said tube.

5. In an electric lamp, a support, a socket in said support, a light transmitting tube having at one end means for engaging said support and at its opposite end a light dispensing means, said tube formingthe sole means for transmitting light generated by a lamp in said socket, a plurality of longitudinal slits in said tube for the insertion of light screens and split rings adapted to be mounted to the exterior of said tube to position said screens.

6. In an electric lamp, a support, a socket in said support, a light transmitting tube having at one end means for engaging said support and at its opposite end a light dispensing means, said tube forming the sole .means for transmitting light generated by an electric bulb in said socket, and means for removably mounting light screens in said tube, said means including split rings mounted on said tube.

In testimony whereof I aflix my signature.

HORACE Gr. MARTIN, JR. 

